Surge Protection Device Manufacturer
Protect your equipment from voltage surges and lightning strikes with certified SPD solutions, ensuring stable operation in industrial, commercial, and residential applications.
- High Safety Standards – IEC certified, tested for surge protection.
- Reliable Performance – Long service life with fast response time.
- Quick Setup – Compact design, user-friendly replacement.
Surge Protection Device Series
Certified products for safe, stable, and efficient power use.
AC Surge Protection Device
Model: STH Series (High Quality)
Model: STM Series (Middle Quality)
Model: STL Series (Standard Quality)
DC Surge Protection Device
Model: DC STD 2P
Model: DC STD 3P
Model: DC STD 4P
Soltree – Trusted Electrical Solutions from China
Work directly with a trusted Chinese manufacturer and save up to 30% vs. local suppliers.
About Soltree
High Quality, Better Price – That’s Soltree
With 15+ years of experience in the electrical industry, Soltree is known for providing high-quality products and reliable service at competitive prices. We are proud to be one of China’s trusted electrical equipment suppliers, with over 100,000㎡ of factory space and 200+ skilled workers.
Supported by strong technical expertise, modern equipment, and strict quality control, we ensure excellence from raw material sourcing to final packaging, maintaining high standards at every step.
Soltree – Reliable Electrical Solutions
Global-Ready, Trusted by Professionals
Soltree delivers reliable smart electrical solutions designed for both residential and commercial use. By combining advanced technology, strict quality control, and efficient production, we provide products that meet international standards while keeping costs competitive. Our goal is to help partners worldwide simplify installation, improve safety, and build smarter energy systems.
Inside Soltree's Workshop
Precision Manufacturing for Surge Protection
At Soltree’s workshop, every Surge Protective Device (SPD) is crafted with strict quality standards and advanced technology. From precision mold making to automated assembly lines, our facility ensures consistent performance and long-lasting reliability. With a focus on electrical safety, we integrate modern testing equipment to simulate real-world surge conditions, guaranteeing that each SPD meets international standards.
Beyond manufacturing, our engineering team continuously invests in research and development to improve surge protection efficiency, durability, and adaptability for different environments. Each device undergoes rigorous quality inspections, covering everything from raw material selection to final product validation. This holistic approach allows us to anticipate customer needs and deliver innovative solutions that stand the test of time.
- Precision Equipment — Advanced machines ensure accuracy
- Automated Processes — Consistent quality with full automation
- Premium Materials — Stronger performance with high-grade copper
Why Choose Soltree Surge Protection Device
Reliable Protection for Electrical Safety
Certified Safety Standards
All SPDs are tested and certified by IEC / CE / ISO, ensuring reliable protection against surges and lightning strikes.
Proven Reliability
Durable design with fast response time, long service life, and stable performance in demanding electrical applications.
Competitive Pricing
Direct manufacturing supply allows us to offer cost-effective solutions without compromising on quality.
Professional Support
Technical guidance, product customization, and timely after-sales service to support your business needs.
Customization That Builds Your Brand
You can change your logo, packaging, product design, and distributor support to make your business stand out.
Customized Logo & Branding
Custom logos, labels, and product copywriting to strengthen your brand identity.
Customized Packaging Options
Retail boxes, bulk packaging, and private label designs tailored to your sales channels.
Customized Product Design
From new specifications to complete ODM projects, we bring your product ideas to life.
Customized Distributor Materials
Customized brochures, manuals, and marketing assets to support your sales network.
Frequently Asked Questions
Here are some typical questions. If yours isn’t on this list, please call customer care.
How can I get a quote for the surge protection device
Please contact our customer service for a quote on our surge protection device. We’re available 24/7. Provide your order details (type, size, quantity), and we’ll assist you through the entire process.
What is your MOQ for the order?
Our minimum order quantity (MOQ) is modest. You can purchase as few as one unit, and we will deliver it just how you want it.
How long will it take for my order to arrive?
Our surge protection device is ready in 7–10 business days, with delivery taking up to 15 additional days. For custom or bulk orders, we’ll confirm the turnaround time before you place your order.
Can I get a sample before I place my order?
Yes, we provide samples for evaluation and approval. Contact our customer service team to get a sample.
Can you make customized surge protection device
Yes, we do make custom surge protection devices. Tell us what you need, and our knowledgeable customer service team will help you through the design process.
How is your after-sales service?
We offer 24/7 after-sales support. Our technical team can help with installation or operation issues, and defective items are covered by repair, replacement, or refund under our warranty policy.
Table of contents
- 1. What Is a Surge Protection Device(SPD)?
- 2. Key Features of Surge Protection Device
- 3. Always Know Your Protection Status
- 4. Flame-Retardant Material for Safer Protection
- 5. Ultra-Fast Response for Lightning Protection
- 6. Compare Our Surge Protection Device Models
- 7. What Makes One Surge Protection Devices Safer Than Another?
- 8. Know more about SPD
1. What Is a Surge Protection Device(SPD)?
Lightning strikes, power grid fluctuations, and line faults are common in power systems, and they can generate instantaneous high-voltage surges that may damage equipment or even cause fires.
Reliable Surge Protection For Safer Power Systems
SPD — Stops danger at the entry, protecting your electrical safety.
Power surges are sudden spikes in voltage that can damage sensitive electronics, disrupt operations, and even cause safety hazards. A Surge Protection Device (SPD) works by instantly detecting abnormal voltage and diverting the excess energy safely into the ground, preventing it from reaching connected equipment. Simple to install yet highly effective, SPDs are essential guardians for both homes and businesses, ensuring reliable power and long-term protection.
2. Key Features of Surge Protection Device
Surge Protection Device (SPD) safeguards electrical systems by preventing sudden voltage spikes from damaging equipment. They ensure safer, more reliable power for homes, offices, and industries. Below are six key features that make Soltree SPD an essential part of modern electrical protection.
- Surge Protection:
Responds within nanoseconds to instantly block harmful voltage surges.
- Flame-retardant Housing:
Built with fire-resistant materials to enhance safety and reliability.
- DIN Rail Mounting:
Quick and convenient installation with globally compatible DIN rail standards
- Modular Design:
Flexible structure allows convenient replacement and maintenance.
- Multiple Protection:
Provides comprehensive defense against lightning, overvoltage, and transient surges.
- Strong Endurance
Durable construction ensures long-lasting performance under harsh conditions.
3. Always Know Your Protection Status
Traditional surge protection device lack a status window, making it impossible to know when the device is damaged and needs replacement. The new SPD comes with a built-in indicator window, offering a clear and intuitive way to check its working condition.
Clear Status, Instant Reminder
The visual indicator makes system monitoring simple and efficient. A green display means the device is functioning properly, while a red signal clearly alerts you when the module should be replaced. This easy-to-read design helps you act quickly, preventing hidden risks and keeping your power system secure.
By giving you a clear view of the device’s health at all times, the indicator window adds peace of mind and ensures your protection is never left to guesswork.
4. Flame-Retardant Material for Safer Protection
During lightning strikes, the high voltage and current may break through the surge protector and generate sparks. Without flame-retardant materials, the consequences could be disastrous.
Enhanced Safety with Fire-Resistant Design
The flame-retardant enclosure not only strengthens the durability of the device but also provides an added layer of protection in extreme conditions. By effectively reducing the chance of fire spread, it helps secure your power network and safeguards both residential and industrial applications.
Beyond fire resistance, the use of high-quality materials ensures long-term stability and reliability even under repeated surge events. This added assurance means your system remains protected day after day, giving you confidence in both performance and safety.
5. Ultra-Fast Response for Lightning Protection
When facing lightning strikes or other sudden surges, the response speed of a surge protector is critical—only a fast enough reaction can truly safeguard your electrical safety.
Nanosecond-Level Protection You Can Trust
When lightning strikes, every fraction of a second matters. Soltree SPDs are engineered with advanced components that deliver an ultra-short response time—measured in nanoseconds. This lightning-fast action blocks harmful surges before they can reach your equipment, reducing downtime and preventing costly damage.
Beyond speed, Soltree’s precise surge control ensures consistent performance even under extreme conditions. Whether in residential homes, commercial buildings, or industrial facilities, this ultra-fast protection keeps your power systems secure and your critical devices running without interruption.
6. Compare Our Surge Protection Device Models
From standard safety to premium performance, Soltree surge protectors deliver the right solution for every need—ensuring your power system is always secure.
| Item / Feature | STL (Standard) AC | STM (Middle) AC | ⭐ STH (High) AC | ⭐ STD (DC) |
|---|---|---|---|---|
| Modular Design | Standard Version | Standard Version | Upgraded pull-out design with heat dissipation | Upgraded pull-out design with heat dissipation |
| Chip Quality | Regular Version | Regular Version | Upgraded Version | Upgraded Version |
| Chip Encapsulation | OBO Type | OBO Type | Shield Type, Independent Chip Encapsulation | Shield Type, Independent Chip Encapsulation |
| Mounting Base | Standard Version | Standard Version | New Version, More Durable | New Version, More Durable |
| Socket Connection | Iron Parts | Iron Parts | High-Quality Copper Parts | High-Quality Copper Parts |
| Tripping Mechanism | Standard Version | Pull Handle, Faster | Top push-trip mechanism, Faster Response | Top push-trip mechanism, Faster Response |
| Chip Pin Connection | Copper Parts | High-Quality Copper | High-Quality Copper | High-Quality Copper |
7. What Makes One Surge Protection Devices Safer Than Another?
The Internal Structure Matters—What’s Different Inside Our Three Surge Protection Devices?
- Poorest quality
Some low-quality surge protectors cut costs by skipping proper epoxy encapsulation, leaving the MOV chip vulnerable to moisture and premature failure. Worse still, without a reliable tripping mechanism, they cannot disconnect in time during lightning strikes—exposing your equipment directly to dangerous high voltage.
- STL Series SPD
STL is Soltree’s standard surge protector. It uses an epoxy-based compound for encapsulation, providing solid protection for the MOV chip. Equipped with a reliable tripping mechanism, it ensures the circuit is promptly disconnected during lightning strikes, safeguarding your equipment from damage.
- STM Series SPD
STM is the upgraded surge protector from Soltree. Like the standard model, it uses an epoxy-based compound for encapsulation to protect the MOV chip. On top of this, it features optimized copper connections, which enhance tripping speed and improve the chip’s precision for more reliable surge protection.
- STH/STD Series SPD
STH and STD series are Soltree’s high-quality surge protectors. They feature independently encapsulated MOV chips with superior heat dissipation, along with extensive use of premium copper components—including screws, springs, and connectors. These upgrades further enhance both the service life and response speed of the device, delivering top-level surge protection.
8. Know more about SPD
Learn more about Surge Protective Devices (SPDs)
1.Surge protective device (SPD) working principle
In the simplest terms, when a transient voltage happens on the protected circuit, a surge protective device stops the current flow by closing its switch contacts, controls the transient voltage, and sends the current back to its source or ground. That stops voltage transients from hurting connected devices. At least one of the parts of the surge safety device must be non-linear. That changes between a high and low impedance state depending on the situation.
The surge protecting device is in a high-impedance condition at normal working voltages, so it doesn’t damage the system. When there is a transient voltage on the circuit, the surge protective device goes into a condition of conduction (or low impedance) and sends the surge current back to its source or ground, much like the normal discharge current. This keeps the voltage at a safer level by limiting or clamping it. After the transient diverts, the surge protecting device immediately goes back to its high-impedance state.
2.Main types of SPD
Type 1 SPD
Installed at the main distribution board or building service entrance.
Designed to discharge high-energy surge currents from direct lightning strikes.
Tested with a 10/350 μs impulse current waveform.
Type 2 SPD
Installed in sub-distribution panels inside the building.
Protects electrical systems and equipment from switching surges and indirect lightning effects.
Tested with an 8/20 μs discharge current waveform.
Type 3 SPD
Installed close to sensitive terminal equipment, such as sockets, plug-in strips, or individual devices.
Provides fine protection against residual surges that pass through Type 1 and Type 2 SPDs.
Tested with a combination waveform (1.2/50 μs voltage and 8/20 μs current).
Type 1+2 SPD
A combined protective device that integrates the functions of Type 1 and Type 2 SPDs.
Capable of withstanding direct lightning currents while also limiting switching surges.
Often used in compact installations to provide comprehensive protection with a single device.
3.Specifications of SPD
Uc: the maximum RMS voltage that an SPD can withstand continuously without degradation, representing the highest voltage the device can operate under normal conditions.
Up: the residual voltage that appears across the SPD when it conducts surge current, representing the actual protection level offered to the connected equipment.
In: the current level of a standardized lightning surge waveform that the SPD can withstand repeatedly, representing its long-term endurance.
Imax: the highest surge current the SPD can withstand once, representing its ultimate capacity.
8/20 μs: the standard surge current waveform used to test the nominal and maximum discharge current of an SPD. It simulates typical switching surges or indirect lightning effects, representing the SPD’s ability to handle frequent surge events.
10/350 μs:the standardized lightning impulse current waveform mainly used for Type 1 SPDs. It simulates direct lightning strikes or high-energy surge conditions, representing the SPD’s capacity to withstand extreme, high-energy impulses.
What Our Customers Say
Trusted by global clients in residential, commercial, and industrial sectors.
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Have questions about our products or need assistance with a project? Our team is ready to help you find the perfect electrical solution.
Mail Address
jacky@cnsoltree.com
Phone/Whatsapp
+86 15658672325
Headquarters
Fenghuang Industrial Zone,BaishiTown,Yueqing Zhejiang P.R. China
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